I have found out through trial & error the easier way to clear the drain hose !!
Just remove 3plastic clips which hold the wheel arch cover on (towards the back of the wheel) , simply pull the wheel arch cover forward, the drainage hose is located towards the top of the wheel arch.
Pull the flap forward and remove the debris from the hose, this will release the trapped water. While the wheel arch cover is off, pour clean water down the top scuttle panel, to ensure the water drains quickly. If you break any of the plastic clips they can be replaced easily by purchasing from Renault ( £1 each).
I expect this will have to be done on a regular basis during Autumn due to leaves/debris collecting in the drainage pipes.
If you follow this advice it will prevent water collecting in the footwells and condensation within the car.
I have had condensation and a damp smell in the car for over a month. When I vacuumed the car I realised it was sopping wet on the carpet and the footwell pocket was full of water. Unfortunately I wasn't aware of this problem or I would have kept on top of the drainage pipes so it wasn't backing up into the footwells.
Hope this helps:)
Peter, December 2013
